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1. Audio. Left Center Right. Used to designate the arrays or loudspeakers in a three-channel system. Always from the audience's perspective, so the "L" would be stage right and the "R" stage left.
2. A/V. (Archaic.) Nomenclature used to denote Kodak E-III projectors in a Chief stacker. "L" on top, "R" on bottom.
3. Electrical. Load Control Relay, may be a part of an Emergency Lighting Transfer System. See the articles at ELTS for more.